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Honda GX120 SG24 Horizontal Engine

The Honda GX120 SG24 Horizontal Engine is a compact commercial-grade power unit designed for plate compactors, reel mowers, pumps, and other equipment requiring a metric output shaft. Its air-cooled 122cc four-stroke OHV design produces 3.2 net HP at 3,600 rpm and 5.5 lb-ft of torque at 2,500 rpm.

Key Specifications

Specification Details
Brand Honda
Model GX120 SG24
Current manufacturer model GX120UT3SG24
Engine type Air-cooled, four-stroke, single-cylinder OHV
Shaft orientation Horizontal
Crankshaft type S-type metric straight shaft
Shaft diameter 18 mm
Shaft length Approximately 2.09″ / 53 mm
End tap M8
Displacement 122cc
Bore × stroke 60 × 43.5 mm
Net power 3.2 HP (2.4 kW) at 3,600 rpm
Maximum net torque 5.5 lb-ft (7.3 Nm) at 2,500 rpm
Compression ratio 8.3:1
Starting system Heavy-duty recoil starter
Ignition Transistorized magneto
Carburetor Butterfly-float type
Governor Centrifugal mechanical
Lubrication Splash
Oil capacity 0.59 US qt / 0.56 liter
Low-oil protection Oil Alert with automatic shutdown
Air cleaner Dual-element
Fuel Unleaded gasoline, 86 octane or higher
Fuel-tank capacity 2.1 US qt / 2.0 liters
PTO rotation Counterclockwise from PTO side
Muffler Included
Throttle control Remote-wire compatible
Dimensions Approximately 297 × 346 × 329 mm
Dry weight Approximately 28.9 lb / 13.2 kg
CARB approved Yes for the current configuration

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